EP0735552A1 - Transformateur à haute tension pour un récepteur de télévision - Google Patents

Transformateur à haute tension pour un récepteur de télévision Download PDF

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Publication number
EP0735552A1
EP0735552A1 EP96104221A EP96104221A EP0735552A1 EP 0735552 A1 EP0735552 A1 EP 0735552A1 EP 96104221 A EP96104221 A EP 96104221A EP 96104221 A EP96104221 A EP 96104221A EP 0735552 A1 EP0735552 A1 EP 0735552A1
Authority
EP
European Patent Office
Prior art keywords
winding
voltage
distance
partial
chambers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96104221A
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German (de)
English (en)
Other versions
EP0735552B1 (fr
Inventor
Walter Goseberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
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Filing date
Publication date
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0735552A1 publication Critical patent/EP0735552A1/fr
Application granted granted Critical
Publication of EP0735552B1 publication Critical patent/EP0735552B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/10—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in series, e.g. for multiplication of voltage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/42—Flyback transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H01F2005/022—Coils wound on non-magnetic supports, e.g. formers wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications

Definitions

  • the invention is based on a high-voltage transformer according to the preamble of claim 1.
  • the charging capacitor for the high voltage is only recharged on the high-voltage winding during the relatively narrow peak of the flyback pulse.
  • This narrow pulse peak results in a relatively large internal resistance for the high voltage source.
  • an odd harmonic such as e.g. the 5th, the 9th, the 13th harmonic.
  • the aforementioned system which is tuned to a frequency, is suddenly triggered to vibrate.
  • the image is controlled so brightly for a few msec for the viewer that a beam current of the order of 3 to 5 mA flows.
  • the generally provided regulation and limitation of the beam current does not start because this control circuit must have a time constant of approximately 10 to 15 ms so that real white areas in the image are not falsified.
  • With such a High beam current generally produces the highest overshoot in the high voltage winding when the high voltage rectifiers are switched off.
  • the return pulse peak on the primary winding on the switching transistor can increase by more than 150 V.
  • the invention has for its object to design the transformer so that the amplitude of the overshoot in the high-voltage winding is significantly reduced.
  • the number of partial windings of the high-voltage winding is greater than the number of diodes, and separate partial windings are tuned to different harmonics.
  • the invention thus turns away from the prior art, in which a harmonization has been carried out as far as possible.
  • the bandwidth of the vibration system is increased in the sense of a bandpass filter characteristic, so that the damping is increased and the quality is reduced.
  • the required precision in tuning is considerably reduced.
  • the adjustment to different harmonics changes the form of the return pulse on the high-voltage winding in such a way that the pulse on the primary winding and thus on the switching transistor remains largely free of disturbing and dangerous voltage increases. This will endanger the switching transistor considerably reduced by such voltage increases.
  • the shape of the return pulse at the high-voltage winding also reduces the internal resistance of the high-voltage source. In addition, the internal resistance is largely independent of tolerances.
  • the above-mentioned LRC circuit previously provided in the primary path and used to suppress voltage increases, is no longer required. Interfering influences of the high-voltage transformer are also considerably reduced by control on neighboring assemblies, such as the video amplifier.
  • Four partial windings are preferably tuned to four different harmonics, in particular to the 7th, the 8.5th, the 9.5th and 11th harmonic of the frequency of the return vibration. This coordination results in a return pulse with a particularly favorable course.
  • the partial windings of the high-voltage winding are preferably in chambers of a chamber bobbin.
  • the matching to the desired harmonic can be achieved by the distance of the chamber base from the core, by the distance of the chambers from each other and / or by the degree of filling of the chambers with the partial winding.
  • Such a chamber bobbin offers several options in its dimensioning to achieve the desired tuning.
  • the distance between the first and second and between the penultimate and last chamber of the chamber bobbin can be significantly smaller than the distance between the other chambers. This reduced distance reduces the winding capacity between the windings and thus makes it easier to tune to a particularly low harmonic.
  • the significantly smaller distance between the chambers at the ends of the coil body is approximately 30-50% of the distance between the other chambers.
  • the first partial winding and the last partial winding then generally have a much lower coupling than the partial windings in the central region of the chamber coil former, which makes it easier to tune to the harmonic desired in each case.
  • the high-voltage winding is constructed according to the diode split principle in that high-voltage rectifier diodes 3, 4, 5 lie between the partial windings W2, W3, W4, W5.
  • the secondary side therefore begins with one winding and ends with one winding. This means that there is no longer a diode between the winding W2 and earth and the winding W5 and the high-voltage connection.
  • the number of partial windings W2-W5 is thus four, which is greater than the number of three diodes 3, 4, 5 between them.
  • the high-voltage winding supplies the high voltage UH to the charging capacitor 6 essentially formed by the anode coating of the picture tube 7.
  • the partial winding W2 is approximately on the 7th harmonic, the partial winding W3 on the 8.5. Harmonics, the partial winding W4 to the 9.5. Harmonics and the partial winding W5 tuned to the 11th harmonic. The windings W3 and W4 together result in a tuning to the 9th harmonic.
  • Fig. 3 shows the return pulse on the high voltage winding in the tuning described.
  • the pulse according to Fig. 3 compared to the pulse.
  • Fig. 2 several advantages.
  • the amplitude of the return pulse which is decisive for the size of the high voltage that can be achieved, is greater.
  • the undesired saddling 12 ′ at the pulse tip is also significantly less, which is advantageous for the internal resistance.
  • the pulse peak is wider, so that the charging time for the charging capacitor is increased and thus the internal resistance is reduced.
  • Another advantage is that at the end of the pulse there is no such high overshoot according to FIG. 2 on a singular frequency, but only an overshoot with reduced amplitude and reduced duration occurs due to interference between the different frequencies that are effective in the tuning.
  • Fig. 4 shows in principle a chamber bobbin 9.
  • the partial windings W of the high-voltage winding are located in chambers 8 of the chamber bobbin 9.
  • the desired tuning to a particular harmonic can be achieved by various design parameters of the chamber bobbin 9. These are in particular the different filling of the chambers 8 shown with a partial winding W, the different spacing a of the chambers from one another due to different thickness of the chamber walls and a different thickness b of the slot base, that is to say the distance of the respective partial winding W from the core carrying the bobbin 9. For example, increasing the distance b reduces the coupling to achieve a certain tuning.
  • FIG. 5 shows a further embodiment of the chamber bobbin 9.
  • the distance c between the first chamber 8a and the second chamber 8b and the distance between the penultimate chamber 8c and the last chamber 8d are significantly smaller than the distance a between the chambers in the central region of the Chamber bobbin 9.
  • the desired tuning to a desired harmonic can be achieved.
  • the larger coupling capacitance between the chambers 8a and 8b and 8c and 8d enables tuning to particularly low harmonics due to the reduced distance c.
  • the distance c is about 30% - 50% of the distance a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Details Of Television Scanning (AREA)
  • Coils Or Transformers For Communication (AREA)
EP96104221A 1995-03-27 1996-03-16 Transformateur à haute tension pour un récepteur de télévision Expired - Lifetime EP0735552B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19510678 1995-03-27
DE19510678A DE19510678A1 (de) 1995-03-27 1995-03-27 Hochspannungstransformator für einen Fernsehempfänger

Publications (2)

Publication Number Publication Date
EP0735552A1 true EP0735552A1 (fr) 1996-10-02
EP0735552B1 EP0735552B1 (fr) 1998-11-18

Family

ID=7757533

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96104221A Expired - Lifetime EP0735552B1 (fr) 1995-03-27 1996-03-16 Transformateur à haute tension pour un récepteur de télévision

Country Status (5)

Country Link
US (1) US5844793A (fr)
EP (1) EP0735552B1 (fr)
JP (1) JPH08273955A (fr)
CN (1) CN1090866C (fr)
DE (2) DE19510678A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19900111A1 (de) * 1999-01-05 2000-07-06 Thomson Brandt Gmbh Diodensplitt-Hochspannungstransformator
EP3131101A1 (fr) * 2015-08-12 2017-02-15 Mahle International GmbH Corps de bobine pour une bobine électrique, bobine électrique comprenant un tel corps de bobine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW369654B (en) * 1997-07-07 1999-09-11 Thomson Brandt Gmbh Diode-split high-voltage transformer
CN1161970C (zh) * 1998-04-09 2004-08-11 皇家菲利浦电子有限公司 高电压变压器
US8553841B2 (en) * 2010-07-26 2013-10-08 X-Ray Optical Systems, Inc. Compact, low noise power supply for advanced electronics applications, and X-ray analyzer applications thereof
US20130214607A1 (en) * 2012-02-17 2013-08-22 Enphase Energy, Inc. Electromagnetic interference cancelling during power conversion

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2504355A1 (de) * 1974-02-04 1975-08-14 Hitachi Ltd Elektronenstrahlroehren-hochspannungsgenerator
EP0033450A1 (fr) * 1980-01-21 1981-08-12 Licentia Patent-Verwaltungs-GmbH Transformateur de lignes pour récepteur de télévision
EP0082966A1 (fr) * 1981-12-28 1983-07-06 International Standard Electric Corporation Tranformateur de lignes pour récepteurs de télévision
US4454572A (en) * 1982-05-27 1984-06-12 Zenith Radio Corporation Flyback transformer with improved regulation
DE3602005A1 (de) * 1985-01-23 1986-07-24 Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto Zeilentransformator
WO1992010906A1 (fr) * 1990-12-10 1992-06-25 Deutsche Thomson-Brandt Gmbh Transformateur h.t. pour postes recepteurs de television

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3562623A (en) * 1968-07-16 1971-02-09 Hughes Aircraft Co Circuit for reducing stray capacity effects in transformer windings
US3657632A (en) * 1969-10-29 1972-04-18 Matsushita Electric Industrial Co Ltd Rectifying device
BE791522A (fr) * 1971-11-18 1973-03-16 Matsushita Electric Industrial Co Ltd Transformateur haute tension associe a un circuit a diviation horizontale
GB1449646A (en) * 1972-11-20 1976-09-15 Matsushita Electric Industrial Co Ltd High voltage generator for television apparatus
US3886434A (en) * 1973-09-07 1975-05-27 Warwick Electronics Inc Flyback transformer
NL159223C (fr) * 1973-10-10
US3947749A (en) * 1975-01-31 1976-03-30 Hitachi, Ltd. Apparatus for generating high voltage for cathode-ray tube
US5576681A (en) * 1990-12-10 1996-11-19 Deutsche Thomson-Brandt Gmbh High voltage transformer
DE4101504A1 (de) * 1991-01-19 1992-07-23 Thomson Brandt Gmbh Schaltung zur zeilenablenkung und hochspannungserzeugung in einem fernsehempfaenger
DE4129678A1 (de) * 1991-09-06 1993-03-11 Thomson Brandt Gmbh Dioden-split-hochspannungstransformator fuer einen fernsehempfaenger
EP0585597B1 (fr) * 1992-08-04 1999-05-12 Deutsche Thomson-Brandt Gmbh Transformateur de ligne à haute tension pour un récepteur de télévision

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2504355A1 (de) * 1974-02-04 1975-08-14 Hitachi Ltd Elektronenstrahlroehren-hochspannungsgenerator
EP0033450A1 (fr) * 1980-01-21 1981-08-12 Licentia Patent-Verwaltungs-GmbH Transformateur de lignes pour récepteur de télévision
EP0082966A1 (fr) * 1981-12-28 1983-07-06 International Standard Electric Corporation Tranformateur de lignes pour récepteurs de télévision
US4454572A (en) * 1982-05-27 1984-06-12 Zenith Radio Corporation Flyback transformer with improved regulation
DE3602005A1 (de) * 1985-01-23 1986-07-24 Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto Zeilentransformator
WO1992010906A1 (fr) * 1990-12-10 1992-06-25 Deutsche Thomson-Brandt Gmbh Transformateur h.t. pour postes recepteurs de television

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19900111A1 (de) * 1999-01-05 2000-07-06 Thomson Brandt Gmbh Diodensplitt-Hochspannungstransformator
US6459350B1 (en) 1999-01-05 2002-10-01 Thomson Licensing Sa Diode-split high-voltage transformer
EP3131101A1 (fr) * 2015-08-12 2017-02-15 Mahle International GmbH Corps de bobine pour une bobine électrique, bobine électrique comprenant un tel corps de bobine

Also Published As

Publication number Publication date
EP0735552B1 (fr) 1998-11-18
JPH08273955A (ja) 1996-10-18
CN1090866C (zh) 2002-09-11
DE19510678A1 (de) 1996-10-02
US5844793A (en) 1998-12-01
DE59600825D1 (de) 1998-12-24
CN1140952A (zh) 1997-01-22

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